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| 1 // Copyright (c) 2013 The Chromium Authors. All rights reserved. |
| 2 // Use of this source code is governed by a BSD-style license that can be |
| 3 // found in the LICENSE file. |
| 4 |
| 5 #ifndef TOOLS_GN_VALUE_H_ |
| 6 #define TOOLS_GN_VALUE_H_ |
| 7 |
| 8 #include "base/basictypes.h" |
| 9 #include "base/logging.h" |
| 10 #include "base/strings/string_piece.h" |
| 11 #include "tools/gn/err.h" |
| 12 |
| 13 class ParseNode; |
| 14 |
| 15 // Represents a variable value in the interpreter. |
| 16 class Value { |
| 17 public: |
| 18 enum Type { |
| 19 NONE = 0, |
| 20 INTEGER, |
| 21 STRING, |
| 22 LIST |
| 23 }; |
| 24 |
| 25 Value(); |
| 26 Value(const ParseNode* origin, Type t); |
| 27 Value(const ParseNode* origin, int64 int_val); |
| 28 Value(const ParseNode* origin, const base::StringPiece& str_val); |
| 29 ~Value(); |
| 30 |
| 31 Type type() const { return type_; } |
| 32 |
| 33 // Returns a string describing the given type. |
| 34 static const char* DescribeType(Type t); |
| 35 |
| 36 // Returns the node that made this. May be NULL. |
| 37 const ParseNode* origin() const { return origin_; } |
| 38 void set_origin(const ParseNode* o) { origin_ = o; } |
| 39 |
| 40 int64& int_value() { |
| 41 DCHECK(type_ == INTEGER); |
| 42 return int_value_; |
| 43 } |
| 44 const int64& int_value() const { |
| 45 DCHECK(type_ == INTEGER); |
| 46 return int_value_; |
| 47 } |
| 48 |
| 49 std::string& string_value() { |
| 50 DCHECK(type_ == STRING); |
| 51 return string_value_; |
| 52 } |
| 53 const std::string& string_value() const { |
| 54 DCHECK(type_ == STRING); |
| 55 return string_value_; |
| 56 } |
| 57 |
| 58 std::vector<Value>& list_value() { |
| 59 DCHECK(type_ == LIST); |
| 60 return list_value_; |
| 61 } |
| 62 const std::vector<Value>& list_value() const { |
| 63 DCHECK(type_ == LIST); |
| 64 return list_value_; |
| 65 } |
| 66 |
| 67 // Returns the current value converted to an int, normally used for |
| 68 // boolean operations. Undefined variables, empty lists, and empty strings |
| 69 // are all interpreted as 0, otherwise 1. |
| 70 int64 InterpretAsInt() const; |
| 71 |
| 72 // Converts the given value to a string. |
| 73 std::string ToString() const; |
| 74 |
| 75 // Verifies that the value is of the given type. If it isn't, returns |
| 76 // false and sets the error. |
| 77 bool VerifyTypeIs(Type t, Err* err) const; |
| 78 |
| 79 // Compares values. Only the "value" is compared, not the origin. |
| 80 bool operator==(const Value& other) const; |
| 81 bool operator!=(const Value& other) const; |
| 82 |
| 83 private: |
| 84 Type type_; |
| 85 std::string string_value_; |
| 86 int64 int_value_; |
| 87 std::vector<Value> list_value_; |
| 88 const ParseNode* origin_; |
| 89 }; |
| 90 |
| 91 #endif // TOOLS_GN_VALUE_H_ |
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